Further Small Fixes

- Some improvements which is same as what has been made in the former commit has made

src/elf.rs

@@ -1,3 +1,4 @@
+use std::ffi::c_char;
 use std::ptr::null_mut;
 
 use crate::{
@@ -20,7 +21,7 @@ fn find_os_from_strtab_elf(elf: &Elf<'_>, pat: &[&str]) -> bool {
     .any(|s| pat.iter().any(|i| s.to_lowercase().contains(i)))
 }
 
-fn find_os_elf(elf: &Elf<'_>, os_abi: u8) -> (ElfOS, *mut i8) {
+fn find_os_elf(elf: &Elf<'_>, os_abi: u8) -> (ElfOS, *mut c_char) {
     let os = {
         match os_abi {
             0x00 => match true {

src/mach.rs

@@ -1,3 +1,4 @@
+use std::ffi::c_char;
 use crate::{
     debug::{debug_objects, merge_members},
     structs::{CharVec, Debugging, ParsingError, ULDDObj, ULDDObjResult},
@@ -11,7 +12,7 @@ use std::ptr::null_mut;
 use crate::debug::option_to_c_string;
 use crate::impls::{ErrorToInt, StringToCString};
 
-fn find_os_mach(mach: &MachO<'_>) -> *mut i8 {
+fn find_os_mach(mach: &MachO<'_>) -> *mut c_char {
     for lc in &mach.load_commands {
         if let BuildVersion(build_version) = lc.command {
             let os = match build_version.platform {

src/pe.rs

@@ -1,3 +1,4 @@
+use std::ffi::c_char;
 use crate::{
     debug::debug_objects,
     structs::{CharVec, ParsingError, ULDDObj, ULDDObjResult},
@@ -8,7 +9,7 @@ use std::ptr::null_mut;
 use crate::debug::option_to_c_string;
 use crate::impls::StringToCString;
 
-fn find_os_pe(pe: &PE<'_>) -> *mut i8 {
+fn find_os_pe(pe: &PE<'_>) -> *mut c_char {
     let Some(optional_header) = pe
         .header
         .optional_header