handle error when clangformat isn't installed

main.py

@@ -1,5 +1,6 @@
 import re
 import subprocess
+import sys
 
 
 def clang_format(file_path):
@@ -9,6 +10,9 @@ def clang_format(file_path):
             command, stderr=subprocess.STDOUT, text=True)
     except subprocess.CalledProcessError as e:
         output = e.output
+    except FileNotFoundError as e:
+        print(f"Command not found: {e.filename}", file=sys.stderr)
+        exit(1)
 
     return output