basic functionality

src/main/java/ru/xzeldon/removeblockoutline/RemoveBlockOutline.java

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+package ru.xzeldon.removeblockoutline;
+
+import net.fabricmc.api.ModInitializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class RemoveBlockOutline implements ModInitializer {
+	// This logger is used to write text to the console and the log file.
+	// It is considered best practice to use your mod id as the logger's name.
+	// That way, it's clear which mod wrote info, warnings, and errors.
+	public static final Logger LOGGER = LoggerFactory.getLogger("removeblockoutline");
+
+	@Override
+	public void onInitialize() {
+		// This code runs as soon as Minecraft is in a mod-load-ready state.
+		// However, some things (like resources) may still be uninitialized.
+		// Proceed with mild caution.
+
+		LOGGER.info("RemoveBlockOutline mod initialized");
+	}
+}

src/main/java/ru/xzeldon/removeblockoutline/mixin/RemoveBlockOutlineMixin.java

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+package ru.xzeldon.removeblockoutline.mixin;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.VertexConsumer;
+import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.entity.Entity;
+import net.minecraft.util.math.BlockPos;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(WorldRenderer.class)
+public class RemoveBlockOutlineMixin {
+	@Inject(method = "drawBlockOutline", at = @At("HEAD"), cancellable = true)
+	private void onDrawBlockOutline(MatrixStack matrixStack, VertexConsumer vertexConsumer, Entity entity, double cameraX, double cameraY, double cameraZ, BlockPos blockPos, BlockState blockState, CallbackInfo ci) {
+		ci.cancel();
+	}
+}