/in/foo.c:1:1: error: unknown type name 'def'
 def recursion(n):
 ^~~
/in/foo.c: In function 'recursion':
/in/foo.c:1:17: error: expected declaration specifiers before ':' token
 def recursion(n):
                 ^
/in/foo.c:1:5: warning: type of 'n' defaults to 'int' [-Wimplicit-int]
 def recursion(n):
     ^~~~~~~~~
/in/foo.c:8:1: warning: control reaches end of non-void function [-Wreturn-type]
 print("%d"%(result))
 ^~~~~