diff --git a/src/api_internal_m.f90 b/src/api_internal_m.f90
index 263f5a72..3220652e 100644
--- a/src/api_internal_m.f90
+++ b/src/api_internal_m.f90
@@ -177,7 +177,7 @@ pure subroutine do_matching_exactly(automaton, string, res, prefix, suffix, runs
       integer :: max_match    !
       character(:), allocatable :: str
 
-      integer :: len_pre, len_post, n
+      integer :: len_pre, len_suf, n
       logical :: empty_pre, empty_post, matches_pre, matches_post
 
       runs_engine = .false.
@@ -190,7 +190,7 @@ pure subroutine do_matching_exactly(automaton, string, res, prefix, suffix, runs
       end if
 
       len_pre = len(prefix)
-      len_post = len(suffix)
+      len_suf = len(suffix)
       n = len(string)
       matches_pre = .true.
       matches_post = .true.
@@ -202,11 +202,18 @@ pure subroutine do_matching_exactly(automaton, string, res, prefix, suffix, runs
             return
          end if
       end if
-
+      
+      ! Returns false if the prefix or suffix is ​​longer than the input string.
+      if (len_pre > len(string) .or. len_suf > len(string)) then
+            res = .false.
+            return
+      end if
+      
       empty_pre   = prefix == ''
       empty_post  = suffix == ''
-      if (.not. empty_pre)  matches_pre = string(1:len_pre) == prefix
-      if (.not. empty_post) matches_post = string(n-len_post+1:n) == suffix
+
+      if (.not. empty_pre) matches_pre = string(1:len_pre) == prefix
+      if (.not. empty_post) matches_post = string(n-len_suf+1:n) == suffix
 
       runs_engine = any([(matches_pre .and. matches_post), &
                          (empty_pre .and. matches_post), &
diff --git a/src/forgex_cli/cli_qpc_qpf.c b/src/forgex_cli/cli_qpc_qpf.c
deleted file mode 100644
index 4dfc036e..00000000
--- a/src/forgex_cli/cli_qpc_qpf.c
+++ /dev/null
@@ -1,11 +0,0 @@
-// This file is a stub to building on Unix-like systems.
-#if defined(_WIN32) || defined(_WIN64)
-#else
-#include <stdbool.h>
-bool QueryPerformanceCounter(long long PerformanceCount_count) {
-   return false;
-}
-bool QueryPerformanceFrequency(long long Frequency_countPerSec) {
-   return false;
-}
-#endif
\ No newline at end of file
diff --git a/src/forgex_cli/cli_time_measurement_m.F90 b/src/forgex_cli/cli_time_measurement_m.F90
index f89ebec6..15924cc6 100644
--- a/src/forgex_cli/cli_time_measurement_m.F90
+++ b/src/forgex_cli/cli_time_measurement_m.F90
@@ -29,6 +29,7 @@ module forgex_cli_time_measurement_m
    logical(c_bool) :: is_succeeded = .false.
 
    !> For Windows, use high-resolution system call for timing.
+#if defined(_WIN32) || defined(_WIN64)
    interface
       function QueryPerformanceCounter(PerformanceCount_count) result(is_succeeded_c) &
             bind(c, name="QueryPerformanceCounter")
@@ -45,11 +46,36 @@ function QueryPerformanceFrequency(Frequency_countPerSec) result(is_supported_c)
          logical(c_bool) :: is_supported_c
       end function QueryPerformanceFrequency
    end interface
+#endif
    !! cf. https://qiita.com/implicit_none/items/86c9117990798c1e8b3b
 
 
 contains
 
+#if defined(_WIN32) || defined(_WIN64)
+#else
+   function QueryPerformanceCounter(PerformanceCount) result(res)
+      use, intrinsic :: iso_c_binding
+      implicit none
+      integer(c_long_long), intent(inout) :: PerformanceCount
+      logical(c_bool):: res
+      PerformanceCount = 1
+      res = .false.
+
+   end function QueryPerformanceCounter
+
+
+   function QueryPerformanceFrequency(PerformanceCountPerSec) result(res)
+      use, intrinsic :: iso_c_binding
+      implicit none
+      integer(c_long_long), intent(inout) :: PerformanceCountPerSec
+      logical(c_bool) :: res
+      PerformanceCountPerSec = 1
+      res = .false.
+
+   end function QueryPerformanceFrequency
+#endif
+
 
    !> This subroutine is for timing purpose and starts a stopwatch.
    subroutine time_begin()