completed hex_color challenge

rust/hex_colors/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "hex_colors"
+version = "0.1.0"
+authors = ["nkoch001 <nilskoch94@gmail.com>"]
+edition = "2018"
+
+[dependencies]

rust/hex_colors/src/main.rs

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+// THIS IS PART OF REDDITS DAILY PROGRAMMING CHALLENGES
+// this programm generates a hex-color-string from decimal input values
+//
+
+// converts a 3-tuple of 8 bit decimals to a color-string of the Format "#FF00EE"
+fn hexcolor(r: u8, g: u8, b: u8) -> String {
+    let result = format!("#{0:03$X}{1:03$X}{2:03$X}", r, g, b, 2);
+    result
+}
+
+// Averages two u8 values
+fn mix(x: u8, y: u8) -> u8 {
+    let sum: u16 = u16::from(x) + u16::from(y);
+    (sum / 2) as u8
+}
+
+// blends two decimal colors
+fn blend_int(x: (u8, u8, u8), y: (u8, u8, u8)) -> String {
+    hexcolor(mix(x.0, y.0), mix(x.1, y.1), mix(x.2, y.2))
+}
+
+// parses hex to uint
+fn parse_hex_to_uint(x: String) -> u8 {
+    u8::from_str_radix(&x, 16).unwrap()
+}
+
+// parses color string to decimal values
+fn parse_hexstring(x: String) -> (u8, u8, u8) {
+    let y = x.trim_start_matches("#").to_string();
+    (
+        parse_hex_to_uint(y[0..2].to_string()),
+        parse_hex_to_uint(y[2..4].to_string()),
+        parse_hex_to_uint(y[4..6].to_string()),
+    )
+}
+
+// blends two color strings
+fn blend(x: (String, String)) -> String {
+    let color_1 = parse_hexstring(x.0);
+    let color_2 = parse_hexstring(x.1);
+    blend_int(color_1, color_2)
+}
+
+fn main() {
+    println!("{}", hexcolor(123, 21, 12));
+    println!("{}", hexcolor(0, 21, 0));
+    println!(
+        "{}",
+        blend((hexcolor(123, 241, 21), hexcolor(201, 94, 111)))
+    );
+}