View Compilation Error

0_0_4456496_85.c: In function `fact':
0_0_4456496_85.c:81: error: syntax error before '/' token
0_0_4456496_85.c: At top level:
0_0_4456496_85.c:116: error: syntax error before '/' token
0_0_4456496_85.c:119: error: syntax error before '&' token
0_0_4456496_85.c:119: error: conflicting types for 'extgcd'
0_0_4456496_85.c:111: error: previous definition of 'extgcd' was here
0_0_4456496_85.c:122: error: conflicting types for 'x'
0_0_4456496_85.c:118: error: previous declaration of 'x' was here
0_0_4456496_85.c:122: error: `c' undeclared here (not in a function)
0_0_4456496_85.c:124: error: `b' undeclared here (not in a function)
0_0_4456496_85.c:125: error: syntax error before "return"
0_0_4456496_85.c: In function `solve':
0_0_4456496_85.c:130: error: syntax error before '/' token