update justfile to not make so much garbage

justfile

@@ -5,26 +5,32 @@ LDFLAGS := if os() == "macos" {
 } else {
     "-lcriterion"
 }
-TESTBIN := "/tmp/all_tests"
+
+TMP := "/tmp"
+
+TESTBIN := TMP/"all_tests"
 
 set shell := ["bash", "-cu"]
 
+
 FOOBAR := "foobar"
 FOOBAR_SOURCE := FOOBAR+".c"
-FOOBAR_EXPANDED := FOOBAR+"-expanded.c"
+FOOBAR_BIN := TMP/FOOBAR
+FOOBAR_EXPANDED := TMP/FOOBAR+"-expanded.c"
 
 run_foobar: build_foobar
-    ./{{FOOBAR}}
+    ./{{FOOBAR_BIN}}
 
 build_foobar: foobar_expanded
-    {{CC}} {{FOOBAR_EXPANDED}} -o {{FOOBAR}} {{CFLAGS}}
+    {{CC}} {{FOOBAR_EXPANDED}} -o {{FOOBAR_BIN}} {{CFLAGS}}
+    echo "{{FOOBAR_BIN}}"
 
 foobar_expanded:
     {{CC}} -P -E {{FOOBAR_SOURCE}} -o {{FOOBAR_EXPANDED}}
     clang-format -i {{FOOBAR_EXPANDED}}
 
 clean_foobar:
-    rm {{FOOBAR}}
+    rm {{FOOBAR_BIN}}
 
 [default]
 test: build

map.c

@@ -234,7 +234,7 @@ void map_assure_growable_by_1(void **this, const char *file, int line) {
 	// The reason for re-hashing is that all hashes are moduloed by the
 	// size of the mapping array, so the resulting hash will likely change.
 	for ( unsigned int i = 0; i < header->n_items; i++ ) {
-		void *pair = &(*this)[i*header->item_size];
+		void *pair = &((uint8_t *)(*this))[i*header->item_size];
 		// This is okay, because we absolutely know that the keys don't already
 		// exist. (assuming all the other code for map is doing it's job)