Update the truncate number function to use decimal point (#333)

* Fixed to truncate as "1.234M" instead of "1234K"

* Optimized by switching to strings to avoid divisions

* Changed FP constants to strings

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

tests/util/Makefile

@@ -3,7 +3,7 @@ CC := gcc
 CFLAGS := -I../../include -I. \
           -g -O3 -std=gnu23 -Wall -Werror -Wno-format
 
-SRC            := util_test.c ../../source/util.c
+SRC            := util_test.c ../../source/util.c ../../source/font.c
 OUT            := build/util_test 
 
 $(OUT): $(SRC) | build