diff --git a/main.py b/main.py
index d85b266..5869796 100644
--- a/main.py
+++ b/main.py
@@ -2,22 +2,49 @@
 import os
 import sys
 
-def get_file_list(path):
-    '''present a list of files'''
-    os.li
-    return None
+def reduce_string(string, min_len):
+    versions = []
+    for i in range(min_len, len(string) + 1):
+        versions.append(string[:i])
+    versions.reverse()
+    return versions
 
-def maximum_common_string(string, listofstrings, minimum_length):
+def maximum_common_string(listofstrings, min_len):
     '''compare items of a list, grouping by common strings, keeping groups as small as possible'''
-    return None
+    for filepath in listofstrings:
+        base = os.path.splitext(os.path.basename(filepath))[0]
+        string_versions = reduce_string(base, min_len)
+        for string in string_versions:
+            common_strings = [x for x in listofstrings if string in x]
+            if len(common_strings) > 2:
+                return (string, common_strings)
+    return
 
-def move_files_into_directory(files, directory):
-    return None
+def safe_move(files, directory):
+    if not os.path.exists(directory):
+        os.makedirs(directory)
+    for item in files:
+        newPath = os.path.join(directory, item)
+        if not os.path.exists(newPath):
+            currentPath = os.path.join(os.path.dirname(directory), item)
+            print(f"moving {os.path.join(os.path.dirname(directory), item)} to {os.path.join(directory, item)}")
+            os.rename(currentPath, newPath)
+        else:
+            print("file exists, skipping")
+    return
 
 def main():
-    filepaths = os.listdir(sys.argv[1])
-    print(filepaths)
-    return None
+    if len(sys.argv) > 1:
+        workingPath = os.path.abspath(sys.argv[1])
+    else:
+        print("need directory")
+        sys.exit()
+    filepaths = os.listdir(workingPath)
+    while strings := maximum_common_string(filepaths, 6):
+        for x in strings[1]:
+            filepaths.pop(filepaths.index(x))
+        safe_move(strings[1], os.path.join(workingPath, strings[0]))
+    return
 
 if __name__ == "__main__":
     main()