fix: make portable seek_and_modify_string_in_file (mac OsX) (#74)

# Description
### Summary:

`n2st::seek_and_modify_string_in_file` was not portable. MacOsx
implementation of `sed` does not have a `--in-place` flag. Refactor
using `-i`




---

# Checklist:

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src/function_library/general_utilities.bash

@@ -48,8 +48,10 @@ function n2st::seek_and_modify_string_in_file() {
   local TMP_CHANGE_FOR="${2}"
   local TMP_FILE_PATH="${3}"
 
-  # Note: Character ';' is used as a delimiter
-  sudo sed --in-place "s;${TMP_SEEK};${TMP_CHANGE_FOR};" "${TMP_FILE_PATH}"
+  # Note:
+  #   - Character ';' is used as a delimiter
+  #   - Keep -i flag for portability to Mac OsX
+  sudo sed -i "s;${TMP_SEEK};${TMP_CHANGE_FOR};" "${TMP_FILE_PATH}"
 
 }