Replace compute_helper.c with compute_helper.zig

Author: tiehuis

build.zig

@@ -9,7 +9,6 @@ pub fn build(b: &Builder) {
     });
 
     const source_files = [][]const u8 {
-        "compute_helper.c",
         "main.c",
     };
 
@@ -19,6 +18,7 @@ pub fn build(b: &Builder) {
 
     const zig_source_files = [][]const u8 {
         "compute.zig",
+        "compute_helper.zig",
         "display.zig",
     };
 

compute.zig

@@ -1,4 +1,4 @@
-pub use @cImport(@cInclude("compute_helper.h"));
+pub use @import("compute_helper.zig");
 
 export fn compute(a: u8) -> u8 {
     compute_helper(a) + 5

compute_helper.c

@@ -0,0 +1,4 @@
+pub fn compute_helper(a: u8) -> u8
+{
+    a + 1
+}