Update base64 function names

src/problem_bank_helpers/problem_bank_helpers.py

@@ -369,17 +369,17 @@ def backticks_to_code_tags(data):
                     value = value.replace("\\`", "`")  # Replace escaped backticks
                     data["params"][param][answer]["value"] = value
 
-def base64_encode_string(string):
-    """Encode a string into a base64 representation to act as a file for prarielearn
+def base64_encode(s):
+    """Encode a regular string into a base64 representation to act as a file for prarielearn to store
     """
     # Based off of https://github.com/PrairieLearn/PrairieLearn/blob/2ff7c5cc2435bae80c0ba512631749f9c3eadb43/exampleCourse/questions/demo/autograder/python/leadingTrailing/server.py#L9-L11
-    return base64.b64encode(string.encode("utf-8")).decode("utf-8")
+    return base64.b64encode(s.encode("utf-8")).decode("utf-8")
 
-def base64_decode_file(file):
-    """Decode a base64 string which is a file from prairielearn into a useable string
+def base64_decode(f):
+    """Decode a base64 string (which is a file) from prairielearn into a useable string
     """
     # symetrical to base64_encode_string
-    return base64.b64decode(to_decode.encode("utf-8")).decode("utf-8")
+    return base64.b64decode(f.encode("utf-8")).decode("utf-8")
 
 def string_to_pl_user_file(string, data):
     """Encode a string to base64 and add it as the user submitted code file
@@ -427,4 +427,4 @@ def choose_el(x, i, j):
         html += "\n".join(elements)
         html += "\n</tr>"
     html += "\n</table>"
-    return html
+    return html