Compiling Issue

imc.c: In function ‘char* imccapitalize(const char*)’:
imc.c:525: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:527: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c: In function ‘char* imc_mudof(const char*)’:
imc.c:597: error: invalid conversion from ‘const char*’ to ‘char*’
imc.c: In function ‘void imc_new_channel(const char*, const char*, const char*, const char*, const char*, bool, int, const char*)’:
imc.c:1089: warning: conversion to ‘short int’ from ‘int’ may alter its value
imc.c: In function ‘int imcfread_number(FILE*)’:
imc.c:1113: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1121: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1125: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1142: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c: In function ‘char* imcfread_line(FILE*)’:
imc.c:1182: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1196: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1209: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c: In function ‘char* imcfread_word(FILE*)’:
imc.c:1242: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1265: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c: In function ‘void imcfread_to_eol(FILE*)’:
imc.c:1292: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c:1298: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c: In function ‘char imcfread_letter(FILE*)’:
imc.c:1320: warning: conversion to ‘char’ from ‘int’ may alter its value
imc.c: In function ‘void imc_recv_broadcast(IMC_PACKET*, char*)’:
imc.c:1901: warning: the address of ‘sender’ will always evaluate as ‘true’
imc.c: In function ‘void imc_recv_chanwho(IMC_PACKET*, char*)’:
imc.c:2028: warning: the address of ‘cwho’ will always evaluate as ‘true’
imc.c: In function ‘void imc_recv_isalive(IMC_PACKET*, char*)’:
imc.c:2640: warning: the address of ‘url’ will always evaluate as ‘true’
imc.c:2646: warning: the address of ‘version’ will always evaluate as ‘true’
imc.c:2652: warning: the address of ‘netname’ will always evaluate as ‘true’
imc.c:2664: warning: the address of ‘host’ will always evaluate as ‘true’
imc.c:2670: warning: the address of ‘iport’ will always evaluate as ‘true’
imc.c: In function ‘void imc_recv_iceupdate(IMC_PACKET*, char*)’:
imc.c:2747: warning: the address of ‘chan’ will always evaluate as ‘true’
imc.c:2766: warning: conversion to ‘short int’ from ‘int’ may alter its value
imc.c: In function ‘void imc_process_authentication(char*)’:
imc.c:3231: warning: the address of ‘rname’ will always evaluate as ‘true’
imc.c:3244: warning: the address of ‘pw’ will always evaluate as ‘true’
imc.c:3287: warning: the address of ‘encrypt’ will always evaluate as ‘true’
imc.c: In function ‘void imc_readchannel(IMC_CHANNEL*, FILE*)’:
make[1]: *** [o/imc.o] Error 1
make: *** [all] Error 2

imc.c: In function ‘char* imc_mudof(const char*)’:
imc.c:597: error: invalid conversion from ‘const char*’ to ‘char*’